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Debt Obligations - Consolidated Debt Obligations Outstanding (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Consolidated debt obligations |  |  |
Plus: premiums/(discounts), net |  | $ (6,207) |
Less: deferred financing costs |  | (10,331) |
Total Debt Obligations |  | 1,938,793 | $ 1,930,828
Secured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | 326,721 | 320,107
Plus: premiums/(discounts), net |  | (1,947) | (2,325)
Less: deferred financing costs |  | (485) | (566)
Total mortgage indebtedness |  | 324,289 | 317,216
Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | 1,628,610 | 1,628,610
Plus: premiums/(discounts), net |  | (4,260) | (4,423)
Less: deferred financing costs |  | (9,846) | (10,575)
Total unsecured indebtedness |  | 1,614,504 | 1,613,612
Two Logan Square [Member] | Secured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | $ 83,630 | 84,440
Effective interest rate |  | 3.98% |
Debt instrument maturity date |  | May 01, 2020 |
Four Tower Bridge [Member] | Secured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | $ 9,639 |
Effective interest rate | [1] | 4.50% |
Debt instrument maturity date |  | Feb. 28, 2021 |
One Commerce Square [Member] | Secured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | $ 121,941 | 123,667
Effective interest rate |  | 3.64% |
Debt instrument maturity date |  | Apr. 05, 2023 |
Two Commerce Square [Member] | Secured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | $ 111,511 | 112,000
Effective interest rate |  | 4.51% |
Debt instrument maturity date |  | Apr. 05, 2023 |
Seven Year Term Loan - Swapped to fixed [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | $ 250,000 | 250,000
Effective interest rate |  | 3.72% |
Debt instrument maturity date |  | Oct. 01, 2022 |
$350M 3.95% Guaranteed Notes due 2023 [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | $ 350,000 | 350,000
Effective interest rate |  | 3.87% |
Debt instrument maturity date |  | Apr. 15, 2018 |
$250.0M 4.10% Guaranteed Notes due 2024 [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | $ 250,000 | 250,000
Effective interest rate |  | 4.33% |
Debt instrument maturity date |  | Feb. 15, 2023 |
$450.0M 3.95% Guaranteed Notes due 2027 [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | $ 450,000 | 450,000
Effective interest rate |  | 4.03% |
Debt instrument maturity date |  | Oct. 01, 2024 |
$250M 4.55% Guaranteed Notes due 2029 [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | $ 250,000 | 250,000
Effective interest rate |  | 4.60% |
Debt instrument maturity date |  | Oct. 01, 2029 |
Indenture IA (Preferred Trust I) [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | $ 27,062 | 27,062
Debt instrument, description of variable rate basis |  | LIBOR + 1.25% |
Spread on variable rate |  | 1.25% |
Debt instrument maturity date |  | Mar. 30, 2035 |
Indenture IB (Preferred Trust I) - Swapped to fixed [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | $ 25,774 | 25,774
Effective interest rate |  | 3.30% |
Debt instrument maturity date |  | Apr. 30, 2035 |
Indenture II (Preferred Trust II) - Swapped to fixed [Member] | Unsecured Debt [Member] |  |  |
Consolidated debt obligations |  |  |
Long-term Debt, Gross |  | $ 25,774 | $ 25,774
Effective interest rate |  | 3.09% |
Debt instrument maturity date |  | Jul. 30, 2035 |
[1] | This loan was assumed upon acquisition of the related property on January 5, 2018. The interest rate reflects the market rate at the time of acquisition.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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